Perhaps you should try some spelling variations:
doanh cuong » doan cuong, doanh thuong, dinh cuong
long luat » cong suat, long cua, cong luan
tong luan » tang luan, dung luan, hang luan
mach hoc » cach hoc, dich hoc, anh hoc
cuong do » cuong vo, huong doi, duong dao
phan van » pham van, thanh van, luan van
ke mach » ke hoach
va phan » van phan, va phat, va phap
va hoi » xa hoi, va hoc, va hoa
do va » do van, so va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ke mach hoc tap, nghien cuu ((long luat) or (tong luan)) doanh cuong do va hoi va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ke mach hoc tap, nghien cuu ((long luat) OR (tong luan)) doanh cuong do va hoi va phan van.
• Adding a wildcard symbol may retrieve word variants: ke mach hoc tap, nghien cuu ((long luat) or (tong luan)) doanh cuong do va hoi va phan van*.